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Every year, Allstate actuaries compile claims data to determine the likelihood of vehicle collisions for drivers in America's 200 largest cities compared to the national average. Auto claims were analyzed from a two-year period, from January 2010 to December 2011. Allstate's ninth annual assessment of auto claims, titled "Allstate America's Best Drivers Report," also found that 70 percent of vehicles involved in auto claims are considered drivable, which indicates that most claims are the result of low-speed (less than 35 miles per hour) collisions. The following are the 10 safest cities overall for drivers based on the results, as well as the safest big cities (with populations exceeding one million people) for driving.